There are two main types of plum blossom couplings, one is the traditional straight claw type, and the other is the curved (concave) claw type zero-backlash coupling. The traditional straight-jaw plum blossom coupling is not suitable for use in high-precision servo transmission applications. The zero-backlash claw type plum blossom coupling is evolved on the basis of the straight claw type, but the difference is that its design can be suitable for the application of the servo system, and it is often used to connect servo motors, stepping motors and ball screws. The curved surface is to reduce the deformation of the elastic plum spacer and limit the influence of centripetal force on it during high-speed operation. The zero-clearance claw coupling is composed of two metal sleeves (usually made of aluminum alloy, stainless steel can also be provided) and a plum blossom elastic spacer. The plum blossom elastic spacer has multiple leaf branches. Like a slider coupling, it also squeezes the plum blossom elastic spacer to match the sleeves on both sides, and its zero clearance performance. Different from the slider coupling, the plum blossom coupling is driven by squeezing while the slider coupling is driven by shear. When using a zero-clearance claw coupling, users should pay attention not to exceed the tolerance of the elastic element given by the manufacturer (under the premise of zero clearance), otherwise the plum elastic spacer will be squashed and deformed and lose its elasticity. The load disappears, resulting in the loss of zero-gap performance, and the user may only find out after a serious problem occurs.

      The plum blossom coupling has good balance performance and is suitable for high-speed applications (speed up to 30,000 rpm), but it cannot handle large deviations, especially axial deviations. Larger eccentricity and deflection angle will produce a larger bearing load than other servo couplings. Another value of concern is the failure of the plum blossom coupling. Once the quincunx elastic spacer is damaged or fails, the torque transmission will not be interrupted, and the metal claws of the two shaft sleeves mesh together to continue to transmit the torque, which is likely to cause problems in the system. Choosing the appropriate plum blossom elastic spacer material according to the actual application is a major advantage of this coupling. Some automation equipment companies can provide plum blossom spacers of various elastic materials, with different hardness and temperature resistance, so that customers can choose the right material. Meet the performance standards of practical applications.